Description: - MTB tapered tube headset adapter for inner diameter conversion of tapered head tube. - With this conversion tool, the inner diameter of the head tube can be converted to the commonly used 44mm/1.73inch, saving installation costs. - Aluminum alloy material, smooth surface, high strength, light weight. - Full CNC machining, high precision, resistance, no rust. - Suitable for mountain bike mtb road bike cycling.Specification: - Material: Aluminum alloy - Size: Approx. - 55 to 44MM: - Minimum inner diameter: 44mm/1.73inch - Outer diameter: 55mm/2.17inch - 56 to 44MM: - Minimum inner diameter: 44mm/1.73inch - Outer diameter: 56mm/2.20inchPackage Includes:1 Piece Headset AdapterNote:1. Please allow slightly error due to manual measurement.2. Due to the difference between different monitors, the picture may not reflect the actual color of the item.3. Wish you a wonderful online shopping!